Drying and crushing device for cement fluid loss agent
The combination of a three-stage conveyor and multiple dryers, combined with a specific conveyor belt and spreader plate structure, solves the problem of incomplete drying of cement fluid loss additive raw materials, achieves more efficient crushing and grinding effects, and improves product quality and production safety.
Patent Information
- Application Number
- CN202422377201.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-09-29
AI Technical Summary
In the prior art, cement fluid loss additive raw materials are piled up during the drying process, resulting in incomplete drying, affecting the subsequent crushing and grinding effects, and causing problems of equipment wear and increased energy consumption.
The machine adopts a combination of three-stage conveyor and multiple dryers, combined with a conveyor belt with a low middle and high sides and a V-shaped pointed spreading plate structure to achieve full mixing and uniform dispersion of raw materials, ensure thorough drying before crushing, and re-grind materials that do not meet the particle size after grinding.
It improves drying efficiency and crushing and grinding effects, reduces equipment wear and energy consumption, and ensures product quality and production safety.
Smart Images
Figure CN223393572U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a drying and crushing device, in particular to a drying and crushing device for a cement fluid loss additive. Background Art
[0002] During oil and gas well cementing operations, the addition of fluid loss additives (FLAs) can reduce cement slurry filtration, improve displacement efficiency, minimize filtrate damage to the formation, prevent cement slurry dehydration, enhance cement stone strength, and prevent annular bridging and interlayer crossflow. These additives enhance permeability, fluidity, and plasticity, thereby improving quality and stability and reducing shrinkage and cracking. In oilfield cementing operations, FLAs are key additives for ensuring cementing quality. With increasing environmental awareness, more and more FLAs are focusing on environmental performance. For example, some natural polymer-based FLAs exhibit excellent environmental performance and are non-polluting. For example, FLAs based on modified cellulose and natural starch, which are large particles or lumps in their original form, require crushing and grinding before use to ensure proper dissolution in drilling fluids.
[0003] In the preparation of modified cellulose and natural starch-based cement fluid loss additives, the raw material crushing, grinding, and drying steps are critical to ensuring product quality and production efficiency. Drying is an essential step in the preparation of cement fluid loss additives, directly impacting the final product quality and production efficiency. The primary purpose of drying is to remove moisture from the raw materials. Drying effectively removes both free and bound water, minimizing the adverse effects of moisture on product performance. Excessive moisture can cause the product to clump during use, compromising its fluid loss reduction effectiveness. Dried raw materials are easier to crush and grind, reducing equipment wear and energy consumption caused by moisture. Furthermore, dried materials exhibit improved fluidity, facilitating smooth operation of automated production lines.
[0004] Raw materials with high moisture content may generate steam during processing, increasing the risk of equipment explosion. Drying can effectively reduce this risk and ensure production safety. Prior to the crushing process, conventional drying typically involves stacking raw materials on a conveyor belt and transporting them to a drying device for drying. However, stacking can hinder evaporation of moisture from the material, resulting in a dry exterior and wet interior, compromising drying efficiency. Furthermore, stacking can cause the material to clump, further complicating subsequent crushing and grinding. Raw materials with high moisture content tend to stick to the crusher during the crushing process, forming a "cushion" that reduces the impact and grinding action of the crusher on the material. This not only increases energy consumption but can also lead to uneven crushing, compromising subsequent grinding. High-moisture material is also prone to sticking to the mill during grinding, increasing wear on the rollers and liners and reducing grinding efficiency. Furthermore, the sticking can clog the screen, affecting the fineness and uniformity of the product. Insufficiently dried raw materials can cause bubbles or cracks during subsequent processing due to moisture evaporation, impacting the physical properties and chemical stability of the product. Especially when preparing cement fluid loss additives, too high a moisture content may cause the product to become ineffective during use and fail to effectively control the water loss of the cement slurry. Utility Model Content
[0005] The utility model provides a cement fluid loss agent drying and pulverizing device to solve the problem that fluid loss agent raw materials are piled up during the drying process, resulting in incomplete drying and affecting the effect and efficiency of subsequent crushing and pulverizing.
[0006] In order to solve the above problems, the technical solution of the present utility model is:
[0007] The drying and crushing device of cement fluid loss reducer described in the utility model includes a first dryer, the first dryer is connected to the second dryer through a transmission device, the second dryer is connected to the third dryer through a transmission device, and the third dryer is connected to a crusher, a fourth dryer, and a grinder in sequence; the transmission device includes a first conveyor, a second conveyor and a third conveyor arranged in sequence, the upper surface conveyor belt of the second conveyor is a conveyor belt with a low middle and high sides, and an averaging plate is suspended on the upper surface of the third conveyor near the conveyor belt position, the averaging plate is vertically arranged, the bottom edge is parallel to the conveyor belt of the third conveyor, and a V-shaped tip is arranged on the side along the opposite direction of the running direction of the conveyor belt of the third conveyor.
[0008] After the raw material solids are initially dried in the first dryer, they are transported to the second conveyor via the first conveyor. The conveyor belt on the second conveyor is low in the middle and high on both sides. This structure can make the raw material solids more concentrated and remix them. They are then transported to the third conveyor. The spreading plate on the third conveyor can flatten and evenly spread the raw material solids on the conveyor belt. After the second conveyor gathers and remixes the materials, they are flattened by the spreading plate on the third conveyor and spread out again, and continue to enter the second dryer for drying. Similarly, the solids dried in the second dryer are again gathered and mixed by the conveyor device. After being flattened and spread out, they enter the third dryer for the third drying. At this time, the solid raw materials have been fully dried before crushing and enter the crusher for crushing.
[0009] After crushing, the water-containing solid inside is exposed and needs to be dried again in the fourth dryer before entering the grinding mill for grinding, which can improve the efficiency and effect of grinding.
[0010] At the same time, the spreading plate is provided with a V-shaped tip in the direction of the solid raw material, which can prevent the material from piling up in the middle of the conveyor belt. The solid material can move to both sides along the V-shaped tip and be spread out flatly, which is conducive to more even dispersion of the solid raw material and improves the drying efficiency and effect.
[0011] Furthermore, the grinding mill is connected to a powder classifier, which is connected to the feed port of the grinding mill. After a grinding operation, solids with particle sizes that do not meet production requirements can be transported back to the grinding mill for re-grinding, thereby further improving the quality of the ground powder.
[0012] Furthermore, the starting end of the second conveyor is set below the end of the first conveyor, and the starting end of the third conveyor is set below the end of the second conveyor. The starting end of the first conveyor is at the same height as the end of the third conveyor.
[0013] The first conveyor, the second conveyor and the third conveyor are connected in an up-down position relationship, but the dryers connected at both ends need to be kept at the same horizontal height to facilitate the arrangement of the machines during the production process.
[0014] Furthermore, the upper surface conveyor belt of the second conveyor is an arc-shaped or V-shaped conveyor belt.
[0015] Furthermore, the averaging plate is arranged above the upper surface of the third conveyor near the end of the second conveyor.
[0016] Working principle:
[0017] After the raw material solids are initially dried in the first dryer, they are transported to the second conveyor via the first conveyor. The conveyor belt on the second conveyor is low in the middle and high on both sides. This structure can make the raw material solids more aggregated and play a role in re-mixing. Then they are transported to the third conveyor. The spreading plate on the third conveyor can flatten the raw material solids on the conveyor belt and spread them evenly. After the second conveyor gathers and re-mixes the materials, they are flattened by the spreading plate on the third conveyor and spread out again, and continue to enter the second dryer for drying. Similarly, the solids dried in the second dryer are again gathered and mixed by the conveyor device, and after being flattened and spread out, they enter the third dryer for the third drying. At this time, the solid raw materials have completed sufficient drying before crushing and enter the crusher for crushing. The crushed solids are further dried in the fourth dryer and then enter the grinding mill to be ground into fine powder. After one grinding, the solids whose particle size does not meet the production requirements can be transported back to the grinding mill for re-grinding to further improve the quality of the grinding.
[0018] The beneficial effects of the utility model are as follows:
[0019] (1) In order to improve the crushing and grinding effect of modified cellulose and natural starch cement fluid loss additives, the utility model sets a three-stage conveyor. A conveyor belt with a low middle and high sides is set on the second stage conveyor. This structure can make the raw material solids more aggregated and play a role in remixing. Then, the raw material solids are conveyed to the third conveyor. The spreading plate on the third conveyor can scrape the raw material solids flat on the conveyor belt, spread them evenly, and dry them in a flat state, which can improve the efficiency and effect of drying.
[0020] (2) The utility model performs three drying operations before crushing, and combined with the transmission by two transmission devices, further improves the drying effect.
[0021] (3) The utility model provides a V-shaped tip on the spreading plate toward the direction of the solid raw materials, which can prevent the materials from piling up in the middle of the conveyor belt. The solid materials can move to both sides along the V-shaped tip and be spread out flatly, which is conducive to more evenly dispersing the solid raw materials and improving the drying efficiency and effect.
[0022] (4) After the utility model performs one grinding, the solids whose particle size does not meet the production requirements can be transported back to the grinding mill for re-grinding, thereby further improving the quality of the grinding. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. In the accompanying drawings:
[0024] Figure 1 This is a structural diagram of a drying and crushing device for cement fluid loss additive of the utility model;
[0025] Figure 2 This is a schematic structural diagram of the transmission device of the present utility model;
[0026] Figure 3 This is a side view of the second conveyor of the present invention;
[0027] Figure 4 This is a top view of the third conveyor of the present invention;
[0028] In the figure: 1. First dryer; 2. Conveyor; 3. Second dryer; 4. Third dryer; 5. Crusher; 6. Fourth dryer; 7. Grinding mill; 8. Powder selector; 9. Spreading plate; 10. First conveyor; 11. Second conveyor; 12. Third conveyor. DETAILED DESCRIPTION
[0029] The present invention will be described in detail below in conjunction with the embodiments.
[0030] Example
[0031] like Figure 1-4 As shown, the drying and crushing device of the cement fluid loss reducer comprises a first dryer 1, the first dryer 1 is connected to the second dryer 3 through a transmission device 2, the second dryer 3 is connected to the third dryer 4 through a transmission device 2, and the third dryer 4 is connected to a crusher 5, a fourth dryer 6, and a grinder 7 in sequence; the transmission device 2 comprises a first conveyor 10, a second conveyor 11 and a third conveyor 12 arranged in sequence, the upper surface conveyor belt of the second conveyor 11 is an arc-shaped conveyor belt with a low middle and high sides, and an averaging plate 9 is suspended on the upper surface of the third conveyor 12 near the conveyor belt position, the averaging plate 9 is vertically arranged, the bottom edge is parallel to the conveyor belt of the third conveyor 12, and a V-shaped tip is arranged on the side along the opposite direction of the conveyor belt of the third conveyor 12.
[0032] After the raw material solids are preliminarily dried by the first dryer 1, they are transported to the second conveyor 11 via the first conveyor 10. The conveyor belt on the upper surface of the second conveyor 11 is a conveyor belt that is low in the middle and high on both sides. This structure can make the raw material solids more aggregated and play a role in remixing. Then they are transported to the third conveyor 12. The spreading plate 9 on the third conveyor 12 can flatten the raw material solids on the conveyor belt and spread them evenly. After the second conveyor 11 gathers and remixes the materials, they are flattened by the spreading plate 9 on the third conveyor 12 and spread out again, and continue to enter the second dryer 3 for drying. Similarly, the solids dried by the second dryer 3 are again re-aggregated and mixed by the conveying device 2. After being scraped and spread out, they enter the third dryer 4 for the third drying. At this time, the solid raw materials have completed sufficient drying before crushing and enter the crusher 5 for crushing.
[0033] After the crushing, the solids containing moisture inside are exposed and need to be dried again in the fourth dryer 6 before entering the grinding mill 7 for grinding, which can improve the efficiency and effect of grinding.
[0034] At the same time, the spreading plate 9 is provided with a V-shaped tip in the direction of the solid raw material, which can prevent the material from piling up in the middle of the conveyor belt. The solid material can move to both sides along the V-shaped tip and be spread out flatly, which is conducive to more evenly dispersing the solid raw material and improving the drying efficiency and effect.
[0035] It is understandable that the grinding mill 7 is connected to the powder classifier 8, and the powder classifier 8 is connected to the feed port of the grinding mill 7. After a grinding operation, the solids whose particle size does not meet the production requirements can be transported back to the grinding mill 7 for re-grinding to further improve the quality of the grinding.
[0036] It can be understood that the starting end of the second conveyor 11 is set below the end of the first conveyor 10, and the starting end of the third conveyor 12 is set below the end of the second conveyor 11. The starting end of the first conveyor 10 and the end of the third conveyor 12 are at the same height.
[0037] The first conveyor 10, the second conveyor 11 and the third conveyor 12 are connected in an upper and lower position relationship, but the dryers connected at both ends need to be kept at the same horizontal height to facilitate the arrangement of the machines during the production process.
[0038] It can be understood that the averaging plate 9 is arranged above the upper surface of the third conveyor 12 near the end of the second conveyor 11.
[0039] Working principle:
[0040] After the raw material solids are initially dried by the first dryer 1, they are transported to the second conveyor 11 via the first conveyor 10. The conveyor belt on the upper surface of the second conveyor 11 is a conveyor belt with a low middle and high sides. This structure can make the raw material solids more concentrated and play a role in remixing. Then they are transported to the third conveyor 12. The spreading plate 9 on the third conveyor 12 can flatten the raw material solids on the conveyor belt and spread them evenly. After the second conveyor 11 gathers and remixes the materials, they are flattened by the spreading plate 9 on the third conveyor 12 and spread out again. They continue to enter the second dryer 3 for drying. Similarly, the solids dried by the second dryer 3 are again gathered and mixed by the conveyor device 2. After being flattened and spread out, they enter the third dryer 4 for the third drying. At this time, the solid raw materials have completed sufficient drying before crushing and enter the crusher 5 for crushing. The crushed solids are further dried by the fourth dryer 6 and then enter the grinding mill 7 to be ground into fine powder. After one grinding, the solids whose particle size does not meet the production requirements can be transported back to the grinding mill 7 for re-grinding to further improve the quality of the grinding.
Claims
1. A drying and crushing device for cement fluid loss additive, characterized in that: The invention comprises a first dryer (1), the first dryer (1) is connected to a second dryer (3) through a transmission device (2), the second dryer (3) is connected to a third dryer (4) through a transmission device (2), and the third dryer (4) is connected to a crusher (5), a fourth dryer (6), and a grinding mill (7) in sequence; the transmission device (2) comprises a first conveyor (10), a second conveyor (11), and a third conveyor (12) arranged in sequence, the upper surface conveyor belt of the second conveyor (11) is a conveyor belt with a lower middle and higher sides, and an equalizing plate (9) is suspended on the upper surface of the third conveyor (12) near the conveyor belt position, the equalizing plate (9) is vertically arranged, the bottom edge is parallel to the conveyor belt of the third conveyor (12), and a V-shaped tip is arranged on the side along the opposite direction of the conveyor belt of the third conveyor (12).
2. The drying and crushing device for cement fluid loss additive according to claim 1, characterized in that: The grinding mill (7) is connected to a powder selector (8), and the powder selector (8) is connected to the feed port of the grinding mill (7).
3. The drying and crushing device for cement fluid loss additive according to claim 1, characterized in that: The starting end of the second conveyor (11) is arranged below the end of the first conveyor (10), and the starting end of the third conveyor (12) is arranged below the end of the second conveyor (11).
4. The drying and crushing device for cement fluid loss additive according to claim 3, characterized in that: The starting end of the first conveyor (10) and the end of the third conveyor (12) are at the same height.
5. The drying and crushing device for cement fluid loss additive according to claim 1, characterized in that: The upper surface conveyor belt of the second conveyor (11) is an arc-shaped or V-shaped conveyor belt.
6. The drying and crushing device for cement fluid loss additive according to claim 1, characterized in that: The averaging plate (9) is arranged above the upper surface of the third conveyor (12) near the end of the second conveyor (11).